Warn for support values as node attributes when rerooting

[mmore500]

RE #216

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.69%. Comparing base (fd60b18) to head (1081bcc).
⚠️ Report is 64 commits behind head on main.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #219      +/-   ##
==========================================
- Coverage   88.70%   88.69%   -0.01%     
==========================================
  Files         114      114              
  Lines       12844    12844              
==========================================
- Hits        11393    11392       -1     
- Misses       1451     1452       +1     

Flag	Coverage Δ
unittests	88.69% <ø> (-0.01%)	⬇️

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